Science: CAT'S claws

Among those still discussing and analyzing the cause of the Lockheed
Electra crash (63 dead) near Tell City, Ind. last month, there appears
an ominous possibility: that the aircraft was torn apart in mid-air by
a phenomenon which airmen and meteorologists have taken to calling
CATfor "clear air turbulence." If the theory proves to be
true, pilots will have to find ways to keep their ships out of CAT's
claws.

Every pilot is familiar with ordinary turbulence, which is generally
caused by thunderstorms or some other violent weather disturbance in
the lower atmosphere....